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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2023-1206

hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack

CVE-2023-1206: hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

CVE-2023-1206 at a glance

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Medium
CVSS base score
5.7 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (Red Hat)
Weakness
CWE-327
Fixed releases
  • Red Hat: kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9, kernel-0:4.18.0-513.5.1.el8_9, kernel-0:4.18.0-372.75.1.el8_6, kernel-0:5.14.0-362.8.1.el9_3, kernel-0:5.14.0-70.75.1.el9_0, kernel-rt-0:5.14.0-70.75.1.rt21.146.el9_0 and 6 more in the advisory
Vendor advisories
1 from Red Hat
VulniPulse record
Published

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2023-1206; bulletin-wide values are not repeated here.

Is CVE-2023-1206 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2023-1206 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2023-1206?

Upgrade to a fixed release named by the vendor:

  • Red Hat: kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9, kernel-0:4.18.0-513.5.1.el8_9, kernel-0:4.18.0-372.75.1.el8_6, kernel-0:5.14.0-362.8.1.el9_3, kernel-0:5.14.0-70.75.1.el9_0, kernel-rt-0:5.14.0-70.75.1.rt21.146.el9_0

Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityMedium5.7

    Medium [CVE-2023-1206] hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack

    CVE-2023-1206Source published Source updated

    A hash collision flaw was found in the IPv6 connection lookup table in the Linux kernel’s IPv6 functionality when a user makes a new kind of SYN flood attack. A user located in the local network or with a high bandwidth connection can increase the CPU usage of the server that accepts IPV6 connections up to 95%. Red Hat severity: Moderate — CVSS 5.7 (CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-327. Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.6 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.0 Extended Update Support; Red Hat Virtualization 4 for Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat…

    Affected products in this advisory
    • Red Hat Enterprise Linux 8.6 Extended Update Support
    • Red Hat Enterprise Linux 9.0 Extended Update Support
    • Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
    • Red Hat Enterprise Linux 6

    2 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9
    • kernel-0:4.18.0-513.5.1.el8_9
    • kernel-0:4.18.0-372.75.1.el8_6
    • kernel-0:5.14.0-362.8.1.el9_3

    8 more entries in the full advisory.

    Mitigation guidance
    • https://access.redhat.com/solutions/30453
    Full advisory and evidenceOpen source bulletin

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